#include <stdio.h>
#include <assert.h>
char* my_strcat(char* dest,const char* src)
{
	assert(dest && src);
	char* ret = dest;
	while (*(++dest));
	while (*dest++ = *src++);
	return ret;
}
int main()
{
	char str1[20] = "abcdef";
	char str2[] = "hijk";
	printf("%s\n", my_strcat(str1,str2));
	return 0;
}